What the tool does, how to run it, and what to expect from the result.
Wall area is the room's perimeter times the wall height, minus a standard opening for each door (21 sq ft) and window (15 sq ft). Multiply by the number of coats, then divide by your paint's coverage rate (350 sq ft per gallon is a common average for smooth interior walls, check your can for the exact figure).
A quick way to understand who this helps, what it solves, and where it connects next.
Anyone painting a room who wants to buy the right amount of paint the first time.
Estimating gallons of paint for a room before a trip to the store.
Short answers for the questions people usually have before trying a utility like this.
Yes. It is completely free, with no sign-up and no usage limits.
No. Every number is computed locally in your browser tab.
Coverage depends on the paint formula and the surface texture; a textured or porous wall soaks up more paint than a smooth, previously painted one. Use the figure on your specific can for the most accurate result.
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Enter a room's dimensions to get the wall area and how many gallons of paint you need.
301 sq ftpaintable area, one coat
1.75 gallons6.6 liters, for 2 coat(s)
Coverage varies by paint and surface (350 sq ft/gallon is a common average for smooth walls); check your can's label for the exact figure.